feat(scripts): add arm64 support for Go and Helm on standalone devices

[nhat-14]

Description

Adds architecture-aware installation for standalone device setup so Go and Helm are installed correctly on both amd64 and arm64 hosts.

• Added a new resolve_target_arch() helper to detect and normalize host architecture.
• Updated Go install to download the correct archive using detected architecture.
• Updated Helm install to build tar name and extraction path dynamically from detected architecture.
• Removed hardcoded Helm tar assignment from the device-agent setup path.

Motivation

The scripts previously assumed amd64, which could fail on arm64 standalone devices or install incorrect binaries.

Testing

• Verified Go download URL is architecture-specific.
• Verified Helm tarball name and extracted directory path match detected architecture.
• Verified amd64 behavior remains unchanged.

Checklist

• Tests added/updated
• Documentation updated
• No breaking changes (or documented in footer)
• Conventional commits used

[nhat-14]

@nitparihar
@sanjujunnuthula
This PR was opened from a fork as followed the CONTRIBUTING.md. But it seems to be the reason behind the fail of
sandbox-sanity-test / sandbox-e2e-functional-test-job

Forked one does not expose sandbox repository secrets like HARBOR_PASSWORD to that run and the oras login failure.
Should I make a branch directly from the margo/sandbox

[vireshnavalli]

Hi @nhat-14
we will test this and let you know if any changes required. Thanks for contribution.

You can also verify with sanity pipeline using your branch name as in below screen. So make a branch directly from development branch. Also you need to modify runs-on: to ubuntu-24.04-arm64 in pipeline file, by default pipeline currently runs on amd64.